CRS Report: U.S. Public Diplomacy: Background and Current Issues

…The attitudes and perceptions of foreign publics created in this new environment are often as important as reality, and sometimes can even trump reality. These attitudes affect the ability of the United States to form and maintain alliances in pursuit of common policy objectives; impact the cost and the effectiveness of military operations; influence local populations to either cooperate, support or be hostile as the United States pursues foreign policy and/or military objectives in that country; affect the ability to secure support on issues of particular concern in multilateral fora; and dampen foreign publics’ enthusiasm for U.S. business services and products.

This report cites Matt Armstrong and his work several times throughout the report.